Andalusite 

It is hard mineral, thats why it is most suitable for jewelry, Andalusite's look most beautifulit is properly cut and polished.
When andalusite is Cut with a long axis, for example an oval cut it shows many colors. oval cut mostly gives lighter color in the center and darker color at the ends. and if andalusite stone is cut in round or square shape,a beautiful and unique blen of coloured 
mosaic pattern makes it a perfect gift to wear.

 According to the U.S. Society for Mining, Metallurgy and Exploration in "Industrial Minerals & Rocks: Commodities, Markets, and Uses," a large majority of andalusite extracted in the world today is used in the industry of refractory bricks. Andalusite's properties of high temperature volume stability, mechanical strength, thermal shock resistance and creep resistance, also makes the mineral suitable for using in the metallurgical industry, says the Journal of Minerals & Materials Characterization & Engineering.

Alexanderite 

 

 Ordinary chrysoberyl is yellowish-green and transparent to translucent. 

 

 

When the mineral exhibits good pale green to yellow color and is transparent, then it is used as a gemstone. 

Agate

Agate:-

microcrystalline type variety of silica we know it as a GEM Agate. grain fineness and brightness of color makes a good Agate.